lkml.org 
[lkml]   [2004]   [Sep]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
DateMon, 13 Sep 2004 19:27:02 -0500
Fromhotdog day <>
Subject2.6.9-rc2 and Hyperthreading. (SMT)
I have been testing the 2.6.9-rc1, and 2.6.9-rc2 kernel patches over
the past couple days and have been having some issues with
hyperthreading (SMT) turned on.

This problem first exhibited itself when I was testing
2.6.9-rc2-mm2-love2. I noticed the following quirks that ONLY show
themselves with hyperthreading enabled on my 3.0C Pentium 4.

Random HARD LOCKS. No messages from the kernel. Just a good swift hard lock.

Hard locks when mounting two cdrom drives in quick succession.

Turning off hyperthreading solves these issues. Going back to 2.6.8.1
solves these issues.

I then tried 2.6.9-rc1 with no mm or love patches. I had the exact same issues.

Today I downloaded the prepatch to 2.6.9-rc2 and applied it to clean
2.6.8 source. The issues are still there.

I hope someone is paying attention to the way scheduler tweaks and
changes are affecting SMT enabled kernels. I don't think anyone wants
to disable features of their hardware in order to run an optimized
scheduler.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 14:06    [from the cache]
©2003-2010